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Propane fuel alone is not hot enough to truly braze or silver solder. An Aycetelene "turbo torch" is the bare minium for this task. A Propane/Oxygen setup is also a usable heat source but harder to find. A good rule of thumb is the heat source should be able to melt the base metal you are working with. If you are planning to go much higher than 200 psi, you should have the joints welded and pressure tested.